sugar308Blood sugar 308 mgdl (17.09mmoll) after eating - is that good or bad? We help you interpret your blood sugar values. You have tested your blood sugar after eating and the result was 308 mgdl.Blood sugar 308 mgdl (17.09mmoll) after eating - is that good or bad? We help you interpret your blood sugar values. You have tested your blood sugar after eating and the result was 308 mgdl.